Swift - 一键在文本字段之间跳转

Question

应用程序

        @IBOutlet weak var umCent: UITextField!
        @IBOutlet weak var doisCent: UITextField!
        @IBOutlet weak var cincoCent: UITextField!
        @IBOutlet weak var dezCent: UITextField!
        @IBOutlet weak var vinteCent: UITextField!
        @IBOutlet weak var cinquentaCent: UITextField!
        @IBOutlet weak var umEuro: UITextField!
        @IBOutlet weak var doisEuro: UITextField!
        @IBOutlet weak var cincoEuro: UITextField!
        @IBOutlet weak var dezEuro: UITextField!
        @IBOutlet weak var vinteEuro: UITextField!
        @IBOutlet weak var cinquentaEuro: UITextField!
        @IBOutlet weak var cemEuro: UITextField!
        @IBOutlet weak var duzentosEuro: UITextField!
        @IBOutlet weak var quinhentosEuro: UITextField!

        @IBAction func proximo(_ sender: UIButton) {

        }

当我按下“proximo”按钮时，我想在 15 个文本字段之间跳转，例如，如果我必须编辑 0.01 而我想编辑 0.02，我只需要按下按钮。

Answer 1

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创建一个出口集合

@IBOutlet weak var textFields: [UITextFields]!

在 Interface Builder (IB) 中，以适当的顺序将您的文本字段添加到集合出口。

@IBAction func proximo(_ sender: UIButton)
{
    if let index = textFields.firstIndex { $0.isFirstResponder }
    {
        let nextIndex = (index + 1) % textFields.count // Wraps around back to index 0.

        textFields[nextIndex].becomeFirstResponder()
    }
    else
    {
        // Optional: Select first text field if none was selected (yet).
        textFields[0].becomeFirstResponder()
    }
}